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A prospective study concerning the tonometric viability supervision of 9 digestive free autografts after total pharyngolaryngectomy was conducted. This technic is based on the Henderson and Hasselbalch's equation which calculates the intramucosal pH (pHi) in the graft using a tonometric catheter. When the pHi is under 7.10, there is a graft ischemia. This invasive technique seems to be sensitive and specific provided that minimally rigorous measurement procedures are used. Late graft necrosis is the major limitation of the technique.

Brain stem auditory-evoked responses to a 70 dB SL click masked by high-passed noises were recorded in 12 normal hearing subjects. By applying the technique of derived potentials, the contributions of one-octave-wide frequency bands are assessed. Summation of these derived potentials gives a pattern similar to the unmasked-response waveform. Waves I and III show a strong predominance of high-frequency responses, whereas wave V is discernible down to low-frequency responses.Les potentiels evoques de la cochlee et du tronc cerebral sont enregistres chez 12 sujets conjointement stimules par un clic de 70 dB SL et des bruits passe-haut. En utilisant la technique des potentiels derives, les contributions de bandes de frequence d'une octave sont analysees. La sommation de ces differents potentiels derives donne naissance a une courbe voisine de la reponse au clic non masque. Les ondes I et III presentent principalement des contributions de frequence aigue, tandis que l'onde V est egalement generee par les bande...

(1967). Considerations Sur La Signification Et Les Rapports Du Recrutement Cochleaire Et Vestibulaire. International Audiology: Vol. 6, No. 3, pp. 423-430.